JP2021083421A - Work vehicle - Google Patents

Abstract

To provide a work vehicle that can adjust the attitude of a work device easily without discomfort.SOLUTION: A work vehicle comprises: a traveling vehicle 2 including a rear part to which a work device 50 is coupled so as to be able to roll; a roll angle detection device 30 that can rotate about a roll axis and that detects a roll angle of the traveling vehicle; and an attitude control device 30 disposed at the rear part of the traveling vehicle 2 adjacent to the roll angle detection device 30 to control a rolling attitude of the work device 50 with respect to the traveling vehicle 2 on the basis of a detection value of the roll angle detection device 30. A rotational operation lever 33 and the roll angle detection device 30 are coupled such that, when the roll angle detection device 30 is rotated to the right or the left, the roll angle detection device 30 rotates in a direction opposite to the rotational direction of the rotational operation lever 33.SELECTED DRAWING: Figure 12

Description

The present invention relates to a work vehicle.

Conventionally, a control device for controlling the posture of a work machine connected to the rear part of the vehicle body with respect to the vehicle body and an inclination sensor for detecting an inclination angle (hereinafter referred to as "roll angle") in the left-right direction of the vehicle body are connected to incline. In a work vehicle (for example, an agricultural tractor) that automatically controls the posture of the work machine based on the detected value of the sensor, the tilt sensor is rotatably installed and the tilt sensor is manually rotated to control the posture of the work machine. There are known work vehicles that can be manually adjusted (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2016-028282

In the conventional work vehicle as described above, in order to keep the posture of the work machine horizontal, the work machine is controlled to be tilted so as to cancel the tilt detected by the tilt sensor. Further, since the lever for manually rotating the tilt sensor is configured to directly tilt the tilt sensor, if the tilt sensor is manually tilted clockwise, the work equipment is tilted counterclockwise, which causes a sense of discomfort in operation.

The present invention has been made in view of the above, and an object of the present invention is to provide a work vehicle capable of easily adjusting the posture of a work machine without discomfort.

In order to solve the above-mentioned problems and achieve the object, the work vehicle according to one aspect of the embodiment is provided around the traveling vehicle body (2) in which the work machine (50) is rotatably connected to the rear portion and around the roll axis. A roll angle detecting device (30) that is rotatably provided to detect the roll angle of the traveling vehicle body and a roll angle detecting device (30) provided at the rear portion of the traveling vehicle body (2) in close proximity to the roll angle detecting device (30). The attitude control device (30) for controlling the rolling posture of the work machine (50) with respect to the traveling vehicle body (2) based on the detection value of the roll angle detection device (30), and the roll angle detection device (30) are described above. A rotation operation lever (33) that rotates around the roll axis is provided, and when the rotation operation lever (33) is rotated to the left or right with respect to the traveling direction of the traveling vehicle body (2), the roll angle is obtained. The detection device (30) connects the rotation operation lever (33) and the roll angle detection device (30) so that the rotation operation lever (33) rotates in a direction opposite to the rotation direction. It is characterized by that.

According to the work vehicle according to one aspect of the embodiment, when the rotation operation lever is operated to adjust the posture of the work machine, the roll angle detection device rotates in the direction opposite to the direction in which the rotation operation lever is operated. By moving, the work machine is tilted in the same direction as the rotation operation lever, so that the posture of the work machine can be easily adjusted without discomfort.

FIG. 1 is a schematic left side view of the work vehicle. FIG. 2 is a schematic plan view of the work vehicle. FIG. 3 is a schematic rear view of the work vehicle. FIG. 4 is an explanatory diagram (No. 1) of the manual mode in the attitude control of the working machine. FIG. 5 is an explanatory diagram (No. 2) of the manual mode in the attitude control of the working machine. FIG. 6 is an explanatory diagram of an automatic horizontal mode in attitude control of a working machine. FIG. 7 is an explanatory diagram of a parallel mode in attitude control of a working machine. FIG. 8 is an explanatory diagram (No. 1) of the installation positions of the roll angle detection device and the attitude control device. FIG. 9 is an explanatory diagram (No. 2) of the installation position of the roll angle detection device and the attitude control device. FIG. 10 is an exploded perspective view of the roll angle detecting device. FIG. 11 is an explanatory view (No. 1) of the inclination angle detecting device. FIG. 12 is an explanatory view (No. 2) of the inclination angle detecting device. FIG. 13 is an explanatory diagram of the installation position of the position sensor. FIG. 14 is an explanatory diagram of the installation position of the switch box. FIG. 15 is a schematic view (No. 1) showing the connection between the rotation operation lever of another form and the support bracket of the roll angle detection device. FIG. 16 is a schematic view (No. 2) showing the connection between the rotation operation lever of another form and the support bracket of the roll angle detection device. FIG. 17 is a schematic view (No. 3) showing the connection between the rotation operation lever of another form and the support bracket of the roll angle detection device.

Hereinafter, embodiments of the work vehicle disclosed in the present application will be described in detail with reference to the accompanying drawings. The present invention is not limited to the embodiments shown below.

FIG. 1 is a schematic left side view of the work vehicle 1. FIG. 2 is a schematic plan view of the work vehicle 1. FIG. 3 is a schematic rear view of the work vehicle 1. In the following, as the work vehicle 1, a tractor (agricultural tractor) used when working in a field will be described as an example.

Further, in the following description, the front-rear direction is the traveling direction of the work vehicle, that is, the tractor 1 when traveling straight, and the front side of the traveling direction is defined as "front" and the rear side is defined as "rear". The traveling direction of the tractor 1 is a direction from the driver's seat 7 to the steering wheel 6 described later when the tractor 1 goes straight (see FIGS. 1 and 2).

The left-right direction is a direction horizontally orthogonal to the front-rear direction. Here, the left and right are defined toward the "front" side. That is, with the operator arriving at the driver's seat 7 and facing forward, the left-hand side is "left" and the right-hand side is "right" (see FIGS. 2 and 3). Further, the vertical direction is a direction orthogonal to the front-rear direction and the left-right direction (see FIGS. 1 and 3). The front-back direction, the left-right direction, and the up-down direction are orthogonal to each other in three dimensions.

As shown in FIGS. 1, 2 and 3, the tractor 1 is provided with front wheels 3, 3 and rear wheels 4, 4 at the front and rear portions of the traveling vehicle body 2, respectively, and is mounted on the front portion of the traveling vehicle body 2. The rotational power of the engine E is transmitted to the front wheels 3, 3 and the rear wheels 4, 4 by appropriately decelerating by a transmission in the transmission case 20 (see FIG. 3).

Further, a steering handle 6 supported by a handle post 5 is provided in the central portion of the traveling vehicle body 2, and a driver's seat 7 is provided behind the steering handle 6. Further, although not shown, various operation levers such as a throttle lever for adjusting the rotation speed of the engine E are provided around the steering handle 6.

Further, on the step floor 8 in the center of the traveling vehicle body 2, a clutch pedal 9 is provided on the left side with the handle post 5 interposed therebetween, and the left and right brake pedals 10L and 10R are provided on the right side to brake the left and right rear wheels 4 and 4, respectively. Is provided.

As shown in FIG. 2, the traveling vehicle body 2 includes left and right rear fenders 11 and 11 that cover the left and right rear wheels 4 and 4 from the front and above on both the left and right sides of the driver's seat 7. A main speed change lever 12 is provided on the upper surface (upper surface) of the rear fender 11 on the left side, and a sub-speed, medium speed, high speed, or neutral position is selected behind the main speed change lever 12. A speed change lever 13 is provided.

Further, on the upper surface of the rear fender 11 on the right side, for example, the plowing depth lever 14 for setting the tilling depth by the working machine (for example, the rotary tiller) 50 and the elevating arm 101 are operated to set the height of the working machine 50. A position lever 15 or the like is provided.

Further, the rear portion of the traveling vehicle body 2 is provided with left and right rear frames 16 and 16 (see FIG. 3) that support the left and right rear fenders 11 and 11 from below, respectively. Further, behind the driver's seat 7 at the rear of the traveling vehicle body 2, an arch-shaped rops frame 17 supported by the left and right rear frames 16 and 16 is provided.

The work machine 50 is connected to the rear portion of the traveling vehicle body 2 while being supported by a hitch (for example, a 2P hitch) attached to the rear frame 16 and an elevating arm 101 (including a rear lift rod) so as to be able to ascend and descend. There is. As shown in FIG. 3, the working machine 50 takes out the rotational power transmitted from the engine E from the PTO (Power take-off) shaft 21 provided on the rear surface of the mission case 20, and rotates, for example, the tillage claw. Let them do the cultivation work.

Further, the work machine 50 is rotatably connected to the traveling vehicle body 2 around the PTO axis 21 and is arranged behind the traveling vehicle body 2. Further, the work vehicle (tractor 1) according to the present embodiment has three types of modes for controlling the rolling posture of the work machine 50 with respect to the traveling vehicle body 2 according to the application. Each mode can be switched on and off by a mode changeover switch 61 (see FIG. 2) described later.

Next, with reference to FIGS. 4 to 7, each mode in the posture (that is, rolling posture) control of the work equipment 50 will be described. As described above, in the attitude control of the work equipment 50, the mode changeover switch 61 can be switched to three types of modes: "manual mode", "automatic horizontal mode" and "parallel mode".

4 and 5 are explanatory views of the "manual mode" in the attitude control of the work machine 50. When the operator presses the mode changeover switch 61 to switch the "manual mode" to "on", the right-up switch 62 and the right-down switch that adjust the posture of the work equipment 50 (rolling posture, that is, the posture tilted in the left-right direction). The operation by 63 becomes possible. Note that FIGS. 4 and 5 show a case where the traveling vehicle body 2 is traveling and the work surface Gr such as a field scene where the work machine 50 is used is horizontal.

As shown in FIG. 4, in the "manual mode", one of the left and right elevating arms 101 (in the illustrated example, the right side) is pushed by pressing the right-up switch 62 (see FIG. 2) once or a plurality of times. The rod of the posture change cylinder 24 provided on the elevating arm 101) contracts, and the work machine 50 is pulled up to the upper right. As a result, the work machine 50 rotates in the direction of the arrow R1 via the work machine support member 22, and inclines upward to the right with respect to the work surface Gr.

Further, as shown in FIG. 5, in the "manual mode", the rod of the posture change cylinder 24 is extended by pushing the right-down switch 63 (see FIG. 2) once or a plurality of times, and the work machine 50 is moved to the right. Push down. As a result, the work machine 50 rotates in the direction of the arrow R2 via the work machine support member 22, and inclines downward to the right with respect to the work surface Gr.

The "manual mode" is set to "on" when neither "automatic horizontal mode" nor "parallel mode" is selected by the mode changeover switch 61, that is, when neither is set to "on". It may be configured as.

FIG. 6 is an explanatory diagram of the “automatic horizontal mode” in the attitude control of the work machine 50. When the operator presses the mode changeover switch 61 to switch the "automatic horizontal mode" to "on", as shown in FIG. 6, for example, even if the work surface Gr is tilted, the work machine 50 can perform such a work surface. Regardless of the rolling of the traveling vehicle body 2 traveling on Gr, it is automatically controlled so as to always maintain a horizontal state.

FIG. 7 is an explanatory diagram of the “parallel mode” in the attitude control of the work machine 50. When the operator presses the mode changeover switch 61 to switch the "parallel mode" to the "on", for example, when the work surface Gr is tilted, the work machine 50 is subjected to the work surface Gr. It is automatically controlled so that it is inclined at the same level as the traveling vehicle body 2 rolling along the inclination and is always parallel to the work surface Gr.

The tractor 1 may further have an "inclination mode" in which the work machine 50 is maintained at a preset roll angle regardless of the rolling of the traveling vehicle body 2.

Further, the tractor 1 determines a "backup mode" in which a backward operation with respect to the traveling vehicle body 2 is detected to raise the work machine 50 to a non-working position, and a lowering speed when the work machine 50 is lowered from the non-working position to the working position. It may further have a "deceraration mode" that moderates the impact from the height to a slow speed. The "backup mode" and "decera mode" may be switched on and off by operating the on / off switch.

Further, in order to execute the "decera mode", an electric type that switches the on / off of the electric motor by an on / off switch may be used, or a mechanical type may be used.

Next, the roll angle detection device 30 and the attitude control device 40 will be described with reference to FIGS. 8 to 12. 8 and 9 are explanatory views of installation positions of the roll angle detecting device 30 and the attitude control device 40. Note that FIGS. 8 and 9 show views (perspective views) of the rear portion of the traveling vehicle body 2 as viewed from diagonally above. Further, in the figure, the rear wheels 4 and the like are omitted. Further, in FIG. 9, the driver's seat 7 is omitted.

The roll angle detecting device 30 is a device that detects an inclination angle in the left-right direction about the roll axis of the traveling vehicle body 2, that is, a roll angle. In the tractor 1 according to the present embodiment, an inclination sensor is adopted as the roll angle detecting device 30. Hereinafter, the roll angle detection device 30 will be referred to as a “tilt sensor”.

Conventionally, the roll angle detection device 30 and the attitude control device 40 were located at separate positions. For this reason, the wiring of a wire harness or the like connecting both devices becomes long, the wiring of the wiring becomes complicated, and the assembly becomes difficult. In the work vehicle (tractor 1) according to the present embodiment, the roll angle detection device 30 and the attitude control device 40 are provided close to each other.

As shown in FIGS. 8 and 9, the inclination sensor 30 is provided at the rear portion of the traveling vehicle body 2. More specifically, the inclination sensor 30 is provided directly above the center frame 23 provided behind the driver's seat 7 at the rear of the traveling vehicle body 2. The center frame 23 is a member provided above the left and right rear frames 16 and 16 and bridged between the left and right rear frames 16 and 16 in the left-right direction.

Further, the rear surface (rear surface) of the tilt sensor 30 is covered with a cover (hereinafter, referred to as “tilt sensor cover”) 35. By covering the rear surface of the tilt sensor 30 with the tilt sensor cover 35 in this way, it is possible to prevent the tilt sensor 30 from being affected by mud splashes from the rear. The tilt sensor cover 35 may cover all four sides of the tilt sensor 30, or at least a part of the four sides including the rear surface.

Further, the tilt sensor cover 35 further has a license plate mounting portion 36 to which the license plate P (see FIG. 8) of the vehicle is mounted on the rear surface (rear surface). The details of the tilt sensor 30 will be described later with reference to FIG.

The attitude control device 40 is a device that controls the rolling posture of the work machine 50 (see FIG. 1) with respect to the traveling vehicle body 2. The attitude control device 40 controls the rolling attitude of the work machine 50 by expanding and contracting the rod of the attitude change cylinder 24 based on the detected value of the inclination sensor 30. As shown in FIGS. 8 and 9, the attitude control device 40 is provided at the rear portion of the traveling vehicle body 2. More specifically, the attitude control device 40 is provided at the rear of the traveling vehicle body 2 via a bracket directly below the center frame 23, and is located below the tilt sensor 30 and close to the tilt sensor 30. Has been done.

Further, the attitude control device 40 has a rear surface (rear surface) covered with a cover (hereinafter, referred to as “control device cover”) 45. By covering the rear surface of the attitude control device 40 with the control device cover 45 in this way, it is possible to prevent the attitude control device 40 from being affected by mud splashes from the rear. The control device cover 45 may cover all four sides of the attitude control device 40 or at least a part of the four sides including the rear surface.

As described above, according to the tractor 1 according to the present embodiment, the inclination sensor 30 and the attitude control device 40 are concentrated on the rear portion of the traveling vehicle body 2, so that wiring such as a wire harness can be easily arranged. Thereby, the ease of assembly can be improved. Further, the inclination sensor 30 and the attitude control device 40 can be connected with a short wiring, and the component cost can be reduced. Further, the manufacturing cost can be reduced by improving the ease of assembly and reducing the cost of parts.

Further, since the inclination sensor 30 is located immediately behind (directly behind) the driver's seat 7, the operator can adjust the roll angle of the work machine 50 (see FIG. 3) while sitting on the driver's seat 7. This facilitates fine adjustment of the working machine 50 by the tilt sensor 30. In addition, the tilt sensor 30 can be easily installed.

Further, by providing the license plate mounting portion 36 on the rear surface of the tilt sensor cover 35, the license plate P mounted on the license plate mounting portion 36 is located at the height of the center frame 23. Therefore, the visibility of the license plate P from the outside is improved.

As shown in FIGS. 8 and 9, below the attitude control device 40, an inclination angle detection that detects the attitude (rolling attitude) of the work equipment 50, that is, the inclination angle (roll angle) in the left-right direction with respect to the traveling vehicle body 2. The device 70 is provided close to the attitude control device 40. In the tractor 1 according to the present embodiment, a stroke sensor is adopted as the inclination angle detecting device 70. Hereinafter, the tilt angle detection device 70 will be referred to as a “stroke sensor”. The details of the stroke sensor 70 will be described later with reference to FIG.

The rear surface (rear surface) of the stroke sensor 70 is covered with a cover (hereinafter, referred to as “stroke sensor cover”) 75. By covering the rear surface of the stroke sensor 70 with the stroke sensor cover 75 in this way, it is possible to prevent the stroke sensor 70 from being affected by mud splashes from the rear. The stroke sensor cover 75 may cover all four sides of the stroke sensor 70 or at least a part of the four sides including the rear surface.

As described above, according to the tractor 1 according to the present embodiment, the inclination sensor 30, the attitude control device 40, and the stroke sensor 70 are concentrated in the vicinity of the center frame 23 in the rear portion of the traveling vehicle body 2, and their rear surfaces are covered. By being covered by (tilt sensor cover 35, control device cover 45, and stroke sensor cover 75), it is possible to prevent the influence of mud splashes from the rear on each device (equipment). Further, by attaching the license plate P to the rear surface of the tilt sensor cover 35, the tilt sensor 30 can be doubly protected by the tilt sensor cover 35 and the license plate P.

Further, since the stroke sensor 70 and the attitude control device 40 are close to each other, the stroke sensor 70 and the attitude control device 40 can be connected with a short wiring, which facilitates the wiring and the component cost. Can be reduced. As a result, the manufacturing cost can be further reduced.

As shown in FIGS. 8 and 9, a work machine support member 22 that supports the work machine 50 and tilts (rotates) in the left-right direction along with the rolling of the work machine 50 is provided at the rear portion of the traveling vehicle body 2. There is. That is, the work machine support member 22 is tilted at the same angle as the roll angle of the work machine 50 according to the rolling posture of the work machine 50. Therefore, if the stroke sensor 70 detects the tilt angle of the work machine support member 22 in the left-right direction, the rolling posture of the work machine 50 can be detected.

As described above, according to the tractor 1 according to the present embodiment, the tilt angle of the work machine support member 22 can be detected to detect the rolling posture of the work machine 50 (with respect to the traveling vehicle body), so that the configuration is simplified. .. As a result, the manufacturing cost can be further reduced.

The tilt sensor 30, the attitude control device 40, and the stroke sensor 70 are arranged at the center of the center frame 23 in the left-right direction, and are arranged so as to be aligned on the same line in the up-down direction. As a result, the three devices can be arranged at the shortest distance, and the tilt sensor 30 and the stroke sensor 70 can accurately detect the roll angle of the traveling vehicle body 2 and the posture of the working machine 50, respectively.

Here, the details of the roll angle detection device (tilt sensor) 30 will be described with reference to FIG. FIG. 10 is an exploded perspective view of the roll angle detection device (tilt sensor) 30. In the past, for example, the reference value used as a reference when processing the detection value of the tilt sensor 30 was changed by pressing the switch to tilt the posture of the work machine, but each time the switch is pressed, the posture of the work machine is tilted. The amount of change may vary depending on the model and the like, and the posture adjustment of the working machine 50 may become complicated. Therefore, in the tractor 1 according to the present embodiment, the inclination sensor 30 is rotated around the roll axis L of the traveling vehicle body 2.

As shown in FIG. 10, the tilt sensor 30 which is a roll angle detecting device is provided on the upper surface (upper surface) 23a of the center frame 23. The center frame 23 has the above-mentioned upper surface 23a and a front surface (front surface) 23b bent at a right angle from the upper surface, and is formed in a hook shape in the left and right side views.

A mounting plate 25 is provided on the front surface 23b of the center frame 23 so as to face the front surface 23b and project upward from the center frame 23. A support bracket 32 that supports the sensor body 31 of the tilt sensor 30 is attached to the mounting plate 25. In this way, the tilt sensor 30 is assembled. Further, the mounting plate 25 has a circular first hole portion 25a, and the support bracket 32 has a first shaft portion 32a that protrudes forward and can be inserted into the first hole portion 25a. In the state where the mounting plate 25 is mounted on the center frame 23, the center of the first hole portion 25a is located on the roll axis L of the traveling vehicle body 2.

Further, by inserting the first shaft portion 32a of the support bracket 32 into the first hole portion 25a of the mounting plate 25, the support bracket 32 is laterally oriented with respect to the mounting plate 25 about the roll shaft L of the traveling vehicle body 2. Can be tilted (rotated). Therefore, the sensor main body 31 fixed to the support bracket 32 can rotate around the roll axis L of the traveling vehicle body 2 in a state of being attached to the center frame 23.

As described above, according to the tractor 1 according to the present embodiment, the inclination sensor 30 rotates around the roll axis L of the traveling vehicle body 2, so that the working machine 50 has a rolling posture regardless of the roll angle of the traveling vehicle body 2. Adjustment is possible. As a result, the posture of the working machine 50 can be easily adjusted.

Further, the mounting plate 25 has a second hole portion 25b which is a long hole vertically long, and the support bracket 32 has a second shaft portion 32b which protrudes forward and can be inserted into the second hole portion 25b. There is. By inserting the second shaft portion 32b of the support bracket 32 into the second hole portion 25b of the mounting plate 25, the left-right rotation of the support bracket 32 can be restricted to a predetermined range and excessive rotation can be suppressed. ..

Further, the support bracket 32 is attached with a gap to the upper surface 25a of the attachment plate 25. By passing the wiring connecting the inclination sensor 30 and the attitude control device 40 through such a gap, the wiring is not exposed to the outside, and the appearance can be improved.

Further, with the sensor body 31 attached to the center frame 23 via the support bracket 32, the tilt sensor cover 35 is attached from above so as to cover the sensor body 31. Further, the rotation operation lever 33 is detachably attached to the tilt sensor 30 to the sensor main body 31, strictly speaking, the support bracket 32. The rotation operation lever 33 manually rotates the tilt sensor 30 around the roll shaft L, and when in use, the rotation operation lever 33 is shown through an elongated hole 35a provided on the upper surface of the tilt sensor cover 35 in the left-right direction. As shown by the two-dot broken line inside, it is inserted into the mounting cylinder 32c of the support bracket 32. Further, when not in use, the rotation operation lever 33 is inserted into a hole 35b provided in the vicinity of any of the four corners on the upper surface of the tilt sensor cover 35. As a result, the rotation operation lever 33 is held by the tilt sensor cover 35.

According to the tractor 1 according to the present embodiment, when the operator does not rotate the tilt sensor 30, the rotation operation lever 33 is removed from the sensor main body 31, so that the operator comes into contact with the rotation operation lever 33. It is possible to prevent an unintended change by the operator, that is, an erroneous operation, such that the rolling posture of the work machine 50 is changed. The tilt sensor 30 is covered with the tilt sensor cover 35 to prevent erroneous operation.

Further, as described above, since the tilt sensor 30 is behind the driver's seat 7 (see FIG. 8), when the operator rotates the tilt sensor 30 from the driver's seat 7, the operator operates from the driver's seat 7. It can be operated facing backwards. As a result, the operator can rotate the tilt sensor 30 while visually confirming the movement of the work machine 50.

As shown in FIG. 10, the center frame 23 is provided with clamp portions 26 on at least one of the left and right sides (left side in the illustrated example) with the inclination sensor 30 interposed therebetween. The clamp portion 26 is provided on the lower surface of the center frame 23 (the back surface of the upper surface 23a), and has a clamp member 26 which is a plastic member extending rearward from the center frame 23. By folding the clamp member 26 downward, it is possible to collectively fix the wiring connecting the valve 27 and the attitude control device 40, which will be described later, for adjusting the pressure oil supplied to the attitude change cylinder 24. it can.

As shown in FIG. 9, a valve 27 that is electronically controlled and adjusts the pressure oil to be supplied to the attitude change cylinder 24 is provided directly below the driver's seat 7. The valve 27 is provided on either the left or right side of the elevating cylinder case 102 (in the illustrated example, the right side of the elevating cylinder case 102). In this way, since the valve 27 is on the same side (right side) as the attitude change cylinder 24 in the left-right direction, the length for taking out the flood control can be minimized, and the position is difficult for the operator to see. This makes it easy for workers to work during maintenance. Further, since the valve 27 is in a position where it cannot be seen from the outside, the appearance can be improved. A removable mudguard cover 28 is provided on the outside (right side) of the valve 27. Further, the mudguard cover 28 may be made of rubber so as to be easily attached and detached.

As described above, according to the tractor 1 according to the present embodiment, the wiring connecting the electronically controlled valve 27 and the attitude control device 40 can be arranged below the center frame 23. As a result, the wiring is hidden in the center frame 23, the appearance is not spoiled by the wiring, and the wiring is fixed by the clamp portion 26 as described above, so that the wiring can be easily arranged. ..

Further, here, the details of the inclination angle detecting device (stroke sensor) 70 will be described with reference to FIGS. 11 and 12. 11 and 12 are explanatory views of the tilt angle detection device (stroke sensor) 70. Note that FIG. 11 shows a view (perspective view) of the rear portion of the traveling vehicle body 2 viewed from diagonally above. Further, in the drawing, the stroke sensor cover 75 (see FIG. 8) is omitted. In addition, the rear wheels 4 and the like are also omitted in the figure.

As shown in FIG. 11, the stroke sensor 70 includes a rotation arm 71 that rotates in the left-right direction with the rotation shaft 71a in the front-rear direction as a fulcrum. The stroke sensor 70 is fixed to the rear surface of the seat bracket 19 (see FIG. 9) that supports the driver's seat 7. Further, below the stroke sensor 70, the above-mentioned work machine support member 22 is provided on the rear surface of the mission case 20 (see FIG. 3). The work machine support member 22 is rotatably provided around the PTO shaft 21. Further, a PTO shaft cover 76 is fixed to the upper portion of the work machine support member 22. The PTO shaft cover 76 is fixed so as to press the central portion of the front end edge with the cover fixing plate 77 from above. Further, the cover fixing plate 77 is provided with a connecting rod 77a that projects upward. The connecting rod 77a is connected to the rotating arm 71 of the stroke sensor 70.

As shown in FIG. 12, when the work machine support member 22 to which the work machine 50 (see FIG. 3) is connected via the left and right connecting portions 22a and 22b rotates in the left-right direction as the work machine 50 rolls, the work is performed. The machine support member 22 also rotates in the same manner. When the work machine support member 22 rotates, the rotating arm 71 connected to the connecting rod 77a rotates around the rotating shaft 71a as a fulcrum. Then, the stroke sensor 70 detects the rolling posture of the working machine 50 by detecting the amount of change (rotation amount) of the rotating arm 71.

Further, since the stroke sensor 70 is provided at the rear portion of the traveling vehicle body 2, the stroke sensor 70 and the working machine 50 which is the object to be detected are at the shortest distance, and the rolling posture of the working machine 50 can be detected with high sensitivity.

Next, with reference to FIG. 13, the horizontal control regulation of the working machine 50 (see FIG. 3) using the position sensor 80 will be described. FIG. 13 is an explanatory diagram of the installation position of the position sensor 80. Note that FIG. 13 shows a view (perspective view) of the rear portion of the traveling vehicle body 2 viewed obliquely from the front. As shown in FIG. 13, a position sensor 80 is provided in the vicinity of the elevating arm rotation shaft 101a of any of the left and right elevating arms 101 (left side in the illustrated example) extending rearward from the rear portion of the traveling vehicle body 2. Has been done. The position sensor 80 detects the height of the elevating arm 101.

Then, the attitude control device 40 regulates the horizontal control of the work machine 50 when the position sensor 80 detects that the elevating arm 101 rises by a predetermined height or more. By restricting the horizontal control of the work machine 50 in this way, it is possible to prevent the work machine 50 from tilting (rotating) in the left-right direction at a high position, and the work machine 50 rotates due to an erroneous operation. , It is possible to eliminate the risk of being caught in the rotated work machine 50. Further, it is possible to prevent the traveling vehicle body 2 from being damaged by the work machine 50 rotating at a high position.

The position sensor 80 is supported by the sensor bracket 81, and the sensor bracket 81 is fastened together with the mounting bolt 29a of the rear axle case 29.

Next, with reference to FIG. 14, the arrangement of the switch box 60 including each switch regarding the posture of the work machine 50 (see FIG. 3) including the mode changeover switch 61 will be described. FIG. 14 is an explanatory diagram of the installation position of the switch box 60. Note that FIG. 14 shows a view (perspective view) of the right side portion of the traveling vehicle body 2 viewed from diagonally above. Further, in the figure, the rear wheels 4 and the like are omitted.

As shown in FIG. 14, the switch box 60 includes a mode changeover switch 61, a right-up switch 62, and a right-down switch 63. As described above, the mode changeover switch 61 switches the mode (“manual mode”, “automatic horizontal mode”, and “parallel mode”) for controlling the rolling posture of the work equipment 50 based on the detection value of the tilt sensor 30. Is. Further, the right-up switch 62 and the right-down switch 63 are switches for adjusting the posture (tilt in the left-right direction) of the work equipment 50 in the "manual mode". The mode changeover switch 61, the right-up switch 62, and the right-down switch 63 described above are assembled by a switch box 60. Therefore, the mounting workability is improved.

The switch box 60 is provided on the upper surface (upper surface) of any one of the left and right rear fenders 11 and 11 (in the illustrated example, the right rear fender 11). Therefore, the mode changeover switch 61 is provided on the upper surface of the rear fender 11 on the right side. Further, the switch box 60 is provided on either the left or right side of the tilt sensor 30 (outside on the right side) and in front of the tilt sensor 30. Therefore, the mode changeover switch 61 is provided on the outer side on the right side of the tilt sensor 30 and in front of the tilt sensor 30.

As described above, according to the tractor 1 according to the present embodiment, both the tilt sensor 30 and the mode changeover switch 61 can be easily operated by the operator looking back from the cockpit 7 (see FIG. 2). it can. Further, both the tilt sensor 30, the right-up switch 62 and the right-down switch 63 can be easily operated.

Further, regarding the positional relationship of each switch in the switch box 60, the mode changeover switch 61 is arranged at the rear, and the right-up switch 62 and the right-down switch 63 are arranged at the front. Further, the right-up switch 62 is arranged inside the traveling vehicle body 2 (left side), and the right-down switch 63 is arranged outside the traveling vehicle body 2 (right side). As a result, the posture of the work machine 50 can be adjusted to the sitting posture and feeling of the operator, and the operability can be improved. Further, the mode changeover switch 61, the right-up switch 62, and the right-down switch 63 are arranged behind the hand catcher 18 of the traveling vehicle body 2. This also makes it possible to match the posture of the work machine 50 with the sitting posture and sensation of the operator, and improve the operability.

Further, the switch box 60 is fixed to the upper surface of the rear fender 11 at two points, front and rear. The switch box 60 is fixed to the rear fender 11 with bolts and nuts, and is fastened together with the rear frame 16 on the right side.

Further, a trim 64 such as resin is attached to the outer peripheral edge of the surface (bottom surface) of the switch box 60 facing the upper surface of the rear fender 11 so as to follow the shape of the upper surface of the rear fender 11. As a result, the gap between the bottom surface of the switch box 60 and the top surface of the rear fender 11 can be filled, and waterproofness and dustproofness can be improved. The trim 64 may be mounted on the inner peripheral edge portion of the switch box 60 so that the wiring housed inside the switch box 60 is not damaged on the inner peripheral surface portion of the bottom surface of the switch box 60, that is, in order to protect the wiring. ..

Further, the switch box 60 has a predetermined height (thickness). As a result, wiring such as a wire harness can be stored inside the switch box 60, and only the trunk line is exposed to the outside, so that the appearance can be improved.

Although not shown, the trunk lines of wiring such as wire harnesses are arranged along the rear fender 11, and are collectively fixed, for example, on the lower surface of the rear fender 11 by clamps provided on the rear fender 11. As a result, only the main line of the wiring can be seen from the outside, and the main line is also along the traveling vehicle body 2, so that the appearance can be improved.

Further, on the right side in the left-right direction at the rear of the traveling vehicle body 2, a mechanical descending speed adjusting device (mechanical desera) 100 for adjusting the descending speed of the working machine 50 is provided.

FIG. 15 is a schematic view showing the connection between the rotation operation lever of another form and the support bracket of the roll angle detection device. When the operation unit 33c is operated left and right, the rotation operation lever 33 rotates around the lever rotation shaft 33a. The support bracket 32 to which the sensor body 31 of the tilt sensor 30 is attached is connected to the rotation operation lever 33 by the link arm 34. Since the link arm connecting portion 33b of the rotation operating lever 33 is provided below the lever rotating shaft 33a and the link arm connecting portion 32b of the support bracket 32 is provided above the first shaft portion 32a, the rotation operating lever 33 When the tilt sensor 30 is rotated to the left or right with respect to the traveling direction of the traveling vehicle body 2, that is, around the roll axis, the tilt sensor 30 rotates in the direction opposite to the direction in which the rotation operation lever 33 rotates.

FIG. 16 is a schematic view showing the connection between the rotation operation lever of another form and the support bracket of the roll angle detection device. When the operation unit 33c is operated left and right, the rotation operation lever 33 rotates around the lever rotation shaft 33a. The support bracket 32 to which the sensor body 31 of the tilt sensor 30 is attached is connected to the rotation operation lever 33 by the link arm 34. Since the link arm connecting portion 33b of the rotation operating lever 33 is provided above the lever rotating shaft 33a and the link arm connecting portion 32b of the support bracket 32 is provided below the first shaft portion 32a, the rotating operating lever 33 When the tilt sensor 30 is rotated to the left or right with respect to the traveling direction of the traveling vehicle body 2, that is, around the roll axis, the tilt sensor 30 rotates in the direction opposite to the direction in which the rotation operation lever 33 rotates.

FIG. 17 is a schematic view showing the connection between the rotation operation lever of another form and the support bracket of the roll angle detection device. When the operation unit 33c is operated left and right, the rotation operation lever 33 rotates around the lever rotation shaft 33a. The support bracket 32 to which the sensor body 31 of the tilt sensor 30 is attached is connected to the lever side gear 33d of the rotation operation lever 33 by the support bracket side gear 32d. Therefore, when the rotation operation lever 33 is rotated to the left or right with respect to the traveling direction of the traveling vehicle body 2, that is, around the roll axis, the tilt sensor 30 is in the direction opposite to the direction in which the rotation operation lever 33 rotates. Rotates to.

According to the work vehicle provided with the connection configuration of the rotation operation lever of the other form and the support bracket of the roll angle detection device, the rotation operation lever 33 is manually operated to the left or right with respect to the traveling direction of the traveling vehicle 2. That is, when the rotation operation lever 33 is tilted clockwise or counterclockwise around the roll axis L, the working machine 50 is tilted in the same direction as the rotation operation lever 33 is rotated. Therefore, when the driver or the like stops the traveling vehicle body before the work and operates the rotation operation lever 33 to adjust the work machine 50 to be horizontal, or to adjust the work machine 50 to be tilted at an arbitrary angle. It can be easily operated without any discomfort.

Further, even if a configuration is additionally adopted in which the tilt sensor 30 is rotated in the opposite direction when the rotation operation lever 33 is rotated, the function of holding the work machine 50 horizontally when the traveling vehicle body 2 is tilted is adopted. Since there is no increase in operation procedures such as changing the control mode at the time of adjustment, the posture of the work machine 50 can be adjusted easily as well.

Further, by connecting the rotation operation lever 33 and the inclination sensor 30 with the link arm 34, the arrangement of the rotation operation lever 33 can be freely designed. When the lever rotation shaft 33a is provided on the rear surface of the switch box 60 on the rear fender 11, the posture during operation becomes easier than when it is on the back surface of the driver's seat 7.

Further effects and variations can be easily derived by those skilled in the art. For this reason, the broader aspects of the invention are not limited to the particular details and representative embodiments expressed and described as described above. Therefore, various modifications can be made without departing from the spirit or scope of the general concept of the invention as defined by the appended claims and their equivalents.

1 Work vehicle (tractor)
2 Traveling vehicle body 3 Front wheel 4 Rear wheel 7 Driver's seat 11 Rear fender 15 Position lever 16 Rear frame 17 Lops frame 18 Hand catcher 19 Seat bracket 20 Mission case 21 PTO axis 22 Work equipment support member 23 Center frame 23a Top surface 23b Front surface 24 Posture change cylinder 25 Mounting plate 26 Clamp member 27 Valve 28 Mudguard cover 29 Rear seat wheel case 29a Mounting bolt 30 Roll angle detector (tilt sensor)
31 Sensor body 32 Support bracket 33 Rotation operation lever 35 Cover (tilt sensor cover)
36 License plate mounting part 40 Attitude control device 45 Cover (control device cover)
50 Work equipment 60 Switch box 61 Mode changeover switch 62 Right-up switch 63 Right-down switch 70 Tilt angle detection device (stroke sensor)
75 cover (stroke sensor cover)
76 PTO Axis Cover 80 Position Sensor 81 Sensor Bracket 100 Descent Speed Adjuster (Mecha Decera)
101 Elevating arm 102 Elevating cylinder case 103 Elevating valve 104 Elevating cylinder 105 1st rotating body 106 2nd rotating body 107 1st link arm 108 2nd rotating body 109 2nd link arm 110 1st internal link 111 2nd internal link 112 Bolt 113 Bolt 115 Damper Arm 116 Damper Position Change Member 117 Leaf Spring 120 Elevating Link Mechanism 121 Damper E Engine Gr Work Surface L Roll Axis O Operator P License Plate

Claims (3)

The traveling vehicle body, in which the work equipment is connected to the rear so that it can be rolled,
A roll angle detection device that is rotatably provided around the roll axis and detects the roll angle of the traveling vehicle body.
An attitude control device provided at the rear of the traveling vehicle body close to the roll angle detecting device and controlling the rolling posture of the working machine with respect to the traveling vehicle body based on the detection value of the roll angle detecting device.
A rotation operation lever for rotating the roll angle detection device around the roll axis is provided.
When the rotation operation lever is rotated to the left or right with respect to the traveling direction of the traveling vehicle body, the roll angle detection device rotates in a direction opposite to the direction in which the rotation operation lever rotates. A work vehicle comprising connecting the rotation operation lever and the roll angle detection device. The work according to claim 1, wherein a rotation operation lever that rotates around a lever rotation fulcrum axis and a support bracket of the roll angle detection device that rotates around the roll axis are connected by a link arm. vehicle. The work vehicle according to claim 1, wherein a rotation operation lever that rotates around a lever rotation fulcrum axis and a support bracket of the roll angle detection device that rotates around the roll axis are connected by a gear. ..

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